Multicomponent synthesis of pyroglutamic acid derivatives <i>via</i> Knoevenagel–Michael-hydrolysis-lactamization-decarboxylation (KMHL-D) sequence
作者:Tushar M. Khopade、Prakash K. Warghude、Amol D. Sonawane、Ramakrishna G. Bhat
DOI:10.1039/c8ob02473a
日期:——
and practical method for the synthesis of 3-substituted pyroglutamic acid derivatives is described. One pot multicomponent reaction of Meldrum'sacid, aldehyde and Schiff's base followed an unprecedented chemoselective Knoevenagel–Michael-hydrolysis-lactamization domino sequence to afford 4-carboxy 3-substituted pyroglutamic acid derivatives under mild conditions. A carboxy intermediate formed appears